diff --git a/index.js b/index.js
index d134fce..384c3d7 100644
--- a/index.js
+++ b/index.js
@@ -7,12 +7,14 @@ let smtpTransporter = null
 let smsClient = null // 在调用时，才创建 smsClient，防止 wo.envi 还没有建立好。
 
 module.exports = {
-  sendMail: async function (option) {
+
+  async sendMail (option) {
     // 或者如果smtp参数已经确定，就可以直接定义 sendMail: Bluebird.promisify(Smtp.sendMail).bind(Smtp)
     smtpTransporter = smtpTransporter || NodeMailer.createTransport(wo.envi.SMTP)
     return await util.promisify(smtpTransporter.sendMail).call(smtpTransporter, option)
   },
-  sendSms: async function (phone, option) {
+  
+  async sendSms (phone, option) {
     // 通过option对象，对外提供统一的调用参数格式
     if (/^\+\d+-\d+$/.test(phone)) {
       option = option || {}
@@ -24,7 +26,8 @@ module.exports = {
     }
     return null // 手机号格式错误，或者 option.vendor 错误。
   },
-  sendSmsDxton: async function (phone, msg) {
+  
+  async sendSmsDxton (phone, msg) {
     // 使用 dxton.com 的短信接口。
     var matches = phone.match(/\d+/g)
     var smsNumber, smsUrl
@@ -37,11 +40,11 @@ module.exports = {
     }
     //    return Bluebird.promisify(Http.get)(smsUrl+'&mobile='+smsNumber+"&content="+encodeURIComponent(msg));
     let returnValue = await RequestPromise.get(smsUrl + '&mobile=' + smsNumber + '&content=' + encodeURIComponent(msg))
-    let result = { state: 'FAIL', code: returnValue }
+    let result = { _state: 'SMS_SEND_FAIL', code: returnValue }
     switch (parseInt(returnValue)) {
       // 短信接口代码：http://www.dxton.com/help_detail/2.html
       case 100:
-        return { state: 'DONE', code: '100', msg: 'sendSms: 发送成功 （表示已和我们接口连通）' }
+        return { _state: 'SMS_SENT_SUCCESS', code: '100', msg: 'sendSms: 发送成功 （表示已和我们接口连通）' }
       case 101:
         result.msg = 'sendSms: 验证失败（账号、密码可能错误）'
       case 102:
@@ -69,7 +72,8 @@ module.exports = {
         return result
     }
   },
-  sendSmsAliyun: async function (phone, msgParam, templateCode, signName) {
+
+  async sendSmsAliyun (phone, msgParam, templateCode, signName) {
     // msgParam 是消息模板参数对象，例如 { code: "890353" }
     smsClient =
       smsClient ||
@@ -97,13 +101,13 @@ module.exports = {
         function (res) {
           let { Code } = res
           if (Code === 'OK') {
-            return { state: 'DONE' }
+            return { _state: 'SMS_SENT_SUCCESS' }
           } else {
-            return { state: 'FAIL', result: res }
+            return { _state: 'SMS_SEND_FAIL', result: res }
           }
         },
         function (err) {
-          return { state: 'ERROR', error: err }
+          return { _state: 'SMS_SEND_ERROR', error: err }
         }
       )
   },